one piece card game op 04 OP04-014 UC You can also collect and play with over 100 characters from the One Piece world ONE PIECE CARD GAME OP04-004

The price varies greatly from card to card, with TCGplayer showing (at time of writing) that Seasonal Sequels is cheapest with a market price of $16, while Gifts Given leads the pack at a whopping $407

8 Island

You wont always have that 4 mana of course, but when you do you might generate a two-for-one, or at least really make your graveyard-loving opponents life a lot more difficult while getting a card to replace the Conservator Theres enough graveyard hate in this format that you dont need to run something this inefficient and slow A 5-mana 2/5 Flyer with Ward 2 isnt the worst thing ever, and this can really strip the graveyard bare

This is also true for copies of cards that might exist off the battlefield